I 2 C-bus Components Selection Guide

Capacitive Sensors

The PCA8885 and PCF8885 integrated circuits are capacitive 8-channel proximity switches that use a patented method to detect a change in capacitance on remote sensing plates.

Features

• Dynamic proximity switch with 8 sensor channels

• Support for matrix arrangement of sensors

• Sensing plates can be connected remotely

• Adjustable response time

• Adjustable sensitivity

• Continuous auto-calibration

• Digital processing method

• Direct and latching switch modes

• AEC-Q100 compliant version available for automotive applications

• I²C Fast-mode Plus (Fm+) compatible interface

• Two I²C-bus addresses

• Cascading of two ICs possible

• Interrupt signaling over I²C-bus

• Interrupt output

• Wide voltage operating range (V dd

= 2.5 V to 5.5 V)

• Sleep mode (I dd

< 100 nA)

• Low-power battery operation possible (I dd

~ 10 µA)

• Operating temperature range (T amb

= -40 °C to +85 °C)

• Available in TSSOP28 and SOIC28 package

Applications

• Replacing mechanical switches

• Hermetically sealed keys on a keyboard

• Switches for medical applications

• Touch switch in front of LCD display

• Audio control: on/off, channel, and volume

• User interface and vandal-proof switches

• Switches in or under upholstery, leather, handles, mats, carpets, tiles and glass

• Use of standard metal sanitary parts (for example, a tap) as switch

• Portable communication and entertainment units

• White goods control panel

Capacitive Sensor Selection Guide

Device

Voltage

Range (V)

Input

Capacitive

Range (pF)

Sensor

Channels

Temperature

Range (˚C)

I 2 C Interface

AEC-Q100

Compliant

Package

PCA8885

PCF8885

2.5–5.5

2.5–5.5

10–40

10–40

8

8

-40 to +85

-40 to +85

Fm+

Fm+



TSSOP28,

SOIC28

TSSOP28,

SOIC28

PCF8883 3-9 10-60 1 -40 to +85 1 interrupt SO8, CSP

PCA8886 3-9 10-60 2 -40 to +85 2 interrupts  TSSOP16

25

26

I 2 C-bus Components Selection Guide

Up Your Product’s

“Cool” Factor

Replace mechanical switches with NXP’s capacitive touch and proximity sensors.

Add switches in or under upholstery, leather, handles, mats, carpets, tiles, and glass.

Ideal for use in hermetically sealed keyboard keys, medical applications switches, hazardous environment switches, white goods control, and more.

PCA8885

CAPACITIVE

TOUCH AND

PROXIMITY

SENSOR

FEATURES

` AEC-Q100 compliance for automotive applications

` Dynamic touch and proximity sensor with

8 sensor channels

` Support for remote connectivity to sensing plates

` Adjustable sensitivity with continuous auto-calibration

` I 2 C Fast-mode Plus (Fm+) compatible interface

` Operating voltage range of 2.5 V to 5.5 V

` -40 °C to +85 °C operations